Benjamin hooker



(No Model.)

' B., F. 8: H. HOOKER.

HYDRAULIC AND FLUID PRESSURE AGOUMULATOR. No. 561,992. Patented June 16,1896.

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UNITED STATES PATENT ()FFICE.

BENJAMIN HOOKER, FREDERICK HOOKER, AND HENRY HOOKER, OF LONDON, ENGLAND.

HYDRAULIC AND FLUID PRESSURE ACCUMULATOR.

SPECIFICATION forming 'part of Letters Patent No. 561,992, dated June16, 1896.

Application filed July 31, 1895. Serial No. 557,776. (No model.)

To aZZ whom it may concern:

Be it known that we, BENJAMIN HOOKER, FREDERIOK HOOKER, and HENRYHOOKER, subjects of the Queen of Great Britain and Ireland, residing atPear Tree Court, Farringdon Road, London, England, have invented anImproved Hydraulic and Fluid Pressure Accumulator, of which thefollowing is a specification.

Our invention relates to an improved by draulic or fluid pressureaccumulator; and the invention is devised with the object of providingan apparatus of compact form and simple construction for the purpose ofaccumulating the pressure required for working machines operated by thesaid agent.

In order that the invention may be readily understood, reference is madeto the accompanying drawing, which is a cross-section in a verticalplane of an apparatus constructed in accordance therewith.

The apparatus consists of an outer casing A, which is preferably bell ordome shaped in external appearance, closed at the bottom end, andprovided with a pipe I) for the admission of the water or other liquidemployed, and c is a similar outlet-pipe.

Within the said casing A is an internal chamber 13, preferably ofsimilar shape and having a small opening d at its lower end or baseadapted to be closed by an internal valve 6, which is confined within aguide, as shown. The said inner chamber B is permanently charged withair or gas at any pressure which may be desirable, the said air or gasbeing prevented from escaping by the valve 6 before mentioned.

Liquid is forced into the outer casing A by means of a pump or othersource of supply, and when the liquid-pressure in the outer chamberexceeds the gaseous pressure in the inner B the latter pressure isovercome and the liquid enters the inner chamber also, the ball 6, whichis buoyant, floating on the surface of the admitted liquid. WVhen thedesired working pressure is obtained in the apparatus, the supply is cutoff from the pump to the apparatus by hand or an automatic device orother means. On lowering the pressure within the apparatus by theemission of the liquid from the outer casing liquid is again forced inuntil the working pressure is regained. It will be seen, however, thatwhile the whole of the pressure may be removed from the outer casingthere still remains a constant pressure in the inner chamber, therebyeffecting a great economy of time in raising the pressure necessary forthe proper working of the machine or device to which it is connected. Itwill also be seen that there are no heavily-weighted plungers such asare commonly used in hydraulic-pressure accumulators, the apparatusbeing portable and of extremely simple construction.

The object of the inner chamber is to prevent the escape of thecontained gas, as, being surrounded by liquid and by the outer chamber,the filtration of the gas through the substance of the material (whichis continually taking place when a single chamber is used) is entirelyobviated, the gaseous pressure remaining constant and not liable toreduction from this cause. Moreover, when in operation the pressure onthe water in the outer chamber should not be allowed to fall below thepressure of the gas at which the inner chamber is originally charged,and thus, there being an equivalent pressure on both the outer and innersurfaces of the chamber, there is no effort on the part of the gaseouspressure to escape.

Having thus described our invention, what we claim, and desire to secureby Letters Patent, is-

The combination in a liquid-pressure accumulator of an outer casing, aninner chamber surrounded by water and containing air or gas at apressure having an opening in its base, a buoyant valve adapted to closesaid opening and pipes for the admission and emission of the liquid tothe outer casing the whole being constructed arranged and operatin gsubstantially as described and illustrated.

BENJAMIN HOOKER. FREDERICK HOOKER. HENRY HOOKER. Witnesses:

THOMAS PULLIN, HENRY W. MASTERS.

